Search for psi(2S) -> gamma eta_c(2S) via fully reconstructed eta_c(2S) decays

Understand

We report a search for the decay psi(2S) -> gamma eta_c(2S) in a sample of 25.9 million psi(2S) events collected with the CLEO-c detector.

• No signals are observed in any of the 11 exclusive eta_c(2S) decay modes studied, or in their sum.
• Product branching fraction upper limits are determined as a function of Gamma[eta_c(2S)] for the 11 individual modes.